code: def test_pieplot(df_election):
      "Test Pieplot"
  
      p_pie = df_election.plot_bokeh.pie(
          x="Partei",
          y="2017",
          colormap=[
              "blue",
              "red",
              "yellow",
              "green",
              "purple",
              "orange",
              "grey",
          ],
          title="Results of German Bundestag Election 2017",
          show_figure=False,
      )
  
      p_pie_multiple = df_election.plot_bokeh(
          kind="pie",
          x="Partei",
          colormap=[
              "blue",
              "red",
              "yellow",
              "green",
              "purple",
              "orange",
              "grey",
          ],
          title="Results of German Bundestag Elections [2002-2017]",
          line_color="grey",
          show_figure=False,
      )
  
      p_pie_pandas_backend = df_election.plot.pie(
          x="Partei",
          y="2017",
          colormap=[
              "blue",
              "red",
              "yellow",
              "green",
              "purple",
              "orange",
              "grey",
          ],
          title="Results of German Bundestag Election 2017",
          show_figure=False,
      )
  
      p_pie_multiple_pandas_backend = df_election.plot(
          kind="pie",
          x="Partei",
          colormap=[
              "blue",
              "red",
              "yellow",
              "green",
              "purple",
              "orange",
              "grey",
          ],
          title="Results of German Bundestag Elections [2002-2017]",
          line_color="grey",
          show_figure=False,
      )
  
      layout = pandas_bokeh.plot_grid(
          [
              [p_pie, p_pie_multiple],
              [p_pie_pandas_backend, p_pie_multiple_pandas_backend],
          ],
          width=450,
          height=300,
          show_plot=False,
      )
  
      pandas_bokeh.output_file(
          os.path.join(DIRECTORY, "Plots", "Pieplot.html")
      )
      pandas_bokeh.save(layout)
  
imports: import os
  import numpy
  import pandas
  import pytest
  import pandas_bokeh
label_desc: Use image node_id 22 for calling a global function with example usage: test_pieplot(df_election) without return types